Монгол орны нүүрсхүчлийн хийн хэлбэлзлийн судалгаа

Study of carbon dioxide fluctuations in Mongolia

Abstract

Carbon dioxide (CO₂) concentration is the most important greenhouse gas in the atmosphere that significantly contributes to global warming. It is important to determine the yearly trend that contributes to the reduction of CO₂. In this study, we considered the monthly average of the CO₂ concentration in the atmosphere of Mongolia and calculated the correlation coefficient as a function of ‘MODIS’ ‘NDVI’, air temperature, and wind speed. As shown in the results of a study the annual trend of CO₂ concentrations was inversely related to ‘NDVI’ (R=-0.87, p<0.001) and temperature (R=-0.67, p<0.05), whereas directly related to wind speed (R=0.91, p<0.001). CO₂ concentration has seasonal fluctuations, while vegetation cover plays an important role in the emission and absorption of natural carbon, and is the main factor in the seasonal fluctuations of terrestrial CO₂. Furthermore, we calculated the Tayle-Sen slope, CO₂ concentration (Q=2.31 ppm/year, p<0.001), ‘NDVI’ (Q=0.002 units/year, p<0.05), air temperature (Q=0.1°C/year, p<0.01) and wind speed (Q=0.01m/s/year, p>0.05) have increased over the last 11 years. However, compared to the p-value, the temperature is not higher than the CO₂ concentration. CO₂ concentration has increased throughout all seasons. ‘NDVI’ was less significantly comparable to CO₂ and temperature, while wind speed was increased but it is not significantly. This increase in CO₂ concentration affects spring temperatures and allows plants to start growing earlier. As a result, ‘NDVI’ values increased significantly in the spring season during the study period.